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stutter / rough running / low-power; fueling?

2008 FZ6 with 30k miles, bought used, pretty good condition, maintained well, runs smooth (or at least was the last time I rode it);

The bike was sitting for a few weeks in the garage, I took it out for a ride today, and noticed some rough-running at lower rpms, a stutter on acceleration, especially under load. I did a search of the forum and found topics ranging from bad-fuel to valve-clearance to electrical / ign. coils, but don't think that I read anything that I was related to what I am experiencing.

After riding around for an hour or so, it seemed to clear up, but it's too early to tell if the problem will persist. I suppose I'll have to take it out again to see.

Has anyone else experienced anything similar after letting the bike sit for a while? It was a hot day today, so I don't think it was a cold running issue, and I still noticed the rough-running after the bike had warmed up to running temp [160-180] degrees-F.

A fuel-filter beginning to clog was one of my first guesses; maybe ignition coils but it was running fine a few weeks ago the last time I took it out.. are there issues with the fuel-injection that I should know about (especially letting the bike sit for weeks at a time?)

Re: stutter / rough running / low-power; fueling?

Hi sounds like we are in the same boat. I just bought one at 30000 as well. Mine is a mess previous two owners never did anything more then basic mai ten extra so I have a lot of parts to replace. I been working at getting the rough idle out of my bike as well. Have done a lot of trouble shooting steps. All helped just a bit. Runs fairly good now but think I still have some background issues.

I would recommend changing the plugs and doing the wire fix. Mine were all broken and bad from previous work done to it.

Mine had gas in it while it sat for a year so I had to drain my pump and flush it out. Very little crud in mine but the fuel that came out of the pump was very yellowed. After I did this the bikes idle stabilized quite a lot.

There is a few known issues with the fuel management system as a understand it. Try doing this. If the bike idles bad on start. Shut it down via the kill switch then reflick kill switch to on and start again. This often clears my crappy idle in my bike that happens every once in a while. My other issue is I am running high octane fuel basic 87 or 89 is more preferable in a stock build it burns the fuel off better which is also prolly part of the reason my bike smells like a fuel station when it’s running. I put my first fill in with 93 octane it’s probly also the fuel system cleaner I put in knocking all the varnish off hehe. Once I have the time and money I’ll be taking my bike to a professional bike mechanic and have a good look over done to try and pin point any more issues I over looked could be. Will likely have a shop do my valve adjustment and new cct I staled with guides and maybe a chain if it’s bad. But that’s more a winter thing hehe.